Biometrical threshold of biparietal diameter for certain fetal sex assignment by ultrasound

Mazza, Vincenzo; Contu, Giannina; Falcinelli, Cristina; Battafarano, Santina; Cagnacci, Angelo; Vito, G De; Forabosco, Antonino; Volpe, Annibale

doi:10.1046/j.1469-0705.1999.13050308.x

Cited by 30 publications

(24 citation statements)

References 25 publications

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“…With a cut-off of 4.8 mm a sample of 300 women (mean gestational age 12 WG + 3 days), the sex was correctly determined by ultrasound in 87 % of the males and 89 % of the females. [14,3,5,[15][16][17][18][19]8,20,7,6,21] They found that ultrasound fetal sex determination gave a sensitivity and specificity of 100% from 13 WG but that sex determination was difficult between 11 and 12 WG. However, in this review sex was not evaluable in 7.5 to 40.6 % of cases depending on the series.…”

Section: Discussionmentioning

confidence: 99%

First-trimester determination of fetal gender by ultrasound: measurement of the ano-genital distance

Arfi

Cohen

Canlorbe

et al. 2016

European Journal of Obstetrics & Gynecology and Reproductiv

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Section: Discussionmentioning

confidence: 99%

First-trimester determination of fetal gender by ultrasound: measurement of the ano-genital distance

Arfi

Cohen

Canlorbe

et al. 2016

European Journal of Obstetrics & Gynecology and Reproductiv

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“…To date, only a few studies regarding fetal gender assignment in early pregnancy by ultrasound have been published, and these are usually of an older date and describe only a small sample of patients [8][9][10][11][12][13][14][15][16][17][18][19][20] . The aim of this study was to assess the feasibility and accuracy of fetal gender assignment by transabdominal ultrasound at 12-14 weeks of gestation, during which combined screening for the most common fetal chromosomal anomalies is performed.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound evaluation of fetal gender at 12-14 weeks

Ľubušký¹,

Studničková²,

Skřivánek³

et al. 2012

Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub

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, Martin Prochazka aAims. The aim of this study was to assess the feasibility and accuracy of fetal gender assignment by transabdominal ultrasound at 12-14 weeks of gestation. Methods. Fetal gender assessment was performed in 1222 singleton pregnancies. In all fetuses the crown-rump length (CRL) was measured and the genital area of the fetus was examined in the mid-sagittal plane. The result of ultrasound examination was compared to the phenotypic sex of the newborn after delivery. Results. The feasibility as well as accuracy in determining gender increased with growing fetal CRL. At CRL < 50 mm (gestational age < 11+4) the feasibility was 39.1% and accuracy 30.5% (40.9% in male gender vs 24.3% in female gender). At CRL 50-54.9 mm (gestational age 11+4 to 12+0) the feasibility was 63.5% and accuracy 75.0% (89.1% in male gender vs 66.7% in female gender). At CRL 55-59.9 mm (gestational age 12+0 to 12+2) the feasibility was 90.5% and accuracy 96.6% (99.1% in male gender vs 93.5% in female gender). At CRL ≥ 60 mm (gestational age ≥ 12+2) the feasibility was 97.4% and accuracy 100.0% (100.0% in male gender vs 100.0% in female gender). Conclusions. Fetal gender may reliably be determined when CRL ≥ 60 mm (gestational age ≥ 12+2). Male gender may already be reliably determined when CRL ≥ 55 mm (gestational age ≥ 12+0). If CRL < 50 mm (gestational age < 11+4) the gender cannot be reliably predicted.

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“…Hasta la fecha existen escasos trabajos publicados que valoren la precisión de la determinación ecográfica del sexo fetal durante el primer trimestre (3)(4)(5)(6)(7)(8)(9)(10)(11). El propósito de este trabajo es valorar la precisión de la determinación ecográfica del sexo fetal entre las 11-13+6 semanas de gestación en una serie prospectiva y grande de pacientes, así como determinar las variables ecográficas relacionadas con esta precisión.…”

Section: Introductionunclassified

Determinación Del Sexo Fetal en El Primer Trimestre De La Gestación: Estudio Prospectivo

Burgos

Ten

Pedregosa

et al. 2010

Rev. chil. obstet. ginecol.

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RESUMENObjetivos: Valorar la precisión de la determinación ecográfíca del sexo fetal entre las 11 y las 14 semanas en una cohorte no seleccionada de gestantes. Métodos: Se realizó un estudio prospectivo transversal en una serie consecutiva de 636 gestaciones entre las 11 y 14 semanas, en gestantes que acudieron para el estudio ecográfico rutinario de primer trimestre. Se examinó la región genital del feto en un plano mediosagital, visualizando el "signo sagital" y la dirección en la que apunta el tubérculo genital (craneal en los varones, caudal en las mujeres) ambos indicadores del sexo fetal. La confirmación clínica del sexo fetal se obtuvo después del parto por confirmación telefónica, o por el cariotipo en casos con amniocentesis por indicaciones convencionales. Resultados: Se consiguió asignar el sexo fetal correctamente en el 86,3% de los fetos. La precisión de la asignación ecográfica del sexo fetal fue mayor en varones que en mujeres (el 90,6% de los varones fueron asignados correctamente vs el 83,1% de las mujeres, p<0,05), y se incrementó con la edad gestacional desde un 72% entre las 11 y 11+6 semanas, un 92% entre las 12 y las 12+6 semanas, hasta un 95% entre las 13 y las 13+6 semanas. Conclusión: La determinación ecográfíca del sexo fetal tiene una elevada tasa de precisión a partir de las 13 semanas, lo que sugiere que las pruebas invasivas para la exclusión de enfermedades ligadas al X podrían obviarse cuando se identifica un feto varón a esta edad gestacional. Sin embargo, en fetos identificados como mujeres esta decisión deberá posponerse hasta una edad gestacional más avanzada.PALABRAS CLAVE: Sexo fetal, ultrasonido, diagnóstico prenatal, ecografía del primer trimestre SUMMARYObjective: To assess the accuracy of fetal gender determination by ultrasound at 11-14 weeks of gestation in a large cohort of unselected population. Methods: A prospective cross-sectional study was performed in 636 consecutive pregnancies at 11-14 weeks of gestation, attending for first trimester ultrasound screening. The genital region was examined in the mid-sagittal plane to detect the sagittal sign and the direction in which the genital tubercle pointed (cranial for males, caudal for females) both as markers of fetal gender. The clinical confirmation of fetal gender was obtained from telephonic interviews after delivery or from karyotype in cases scheduled to amniocentesis for conventional indications. Results: Fetal gender was correctly determined by ultrasound in 86.3% of the fetuses. The accuracy of sex assignment was higher in male fetuses than in female fetuses (90.6% of the males fetuses vs 83.1% of the females were correctly assigned, p<0.05) and increased with gestational age from 72% at 11-11+6 week's to 92% at 12-12+6 week's, and 95% at 13-13+6 week's gestation (p<0.01). Conclusion: Prenatal gender assignment by ultrasound has a high accuracy rate at 13 to 13+6 weeks. These results suggest that invasive testing can probably be performed in fetuses identified as males at this gestational age. However in fetus...

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Biometrical threshold of biparietal diameter for certain fetal sex assignment by ultrasound

Abstract: This study provides important information about the earliest stage of fetal development, expressed in terms of BPD, at which a diagnosis of fetal sex can be made with 100% accuracy.

Cited by 30 publications

References 25 publications

First-trimester determination of fetal gender by ultrasound: measurement of the ano-genital distance

First-trimester determination of fetal gender by ultrasound: measurement of the ano-genital distance

Ultrasound evaluation of fetal gender at 12-14 weeks

Determinación Del Sexo Fetal en El Primer Trimestre De La Gestación: Estudio Prospectivo

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